[iwar] Historical posting


From: Fred Cohen
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Mon, Jan 1, 1999 

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Date: Mon, Jan 1, 1999
From: Fred Cohen 
Reply-To: iwar@egroups.com
Subject: [iwar] Historical posting

          


            
 I recall reading a year ago, that some of the strongest TEMPEST
emanations come from the video display, and that an interceptor
would typically capture the "raster scan" to see the screen.
Additionally, that the easiest portion of display to read was
the "black text on white background" (or vice versa) since the
contrast between them is so strong. 

That article mentioned a product that purports to significantly
reduce TEMPEST emanations "through software alone", by replacing
the video driver with a version that (for text alone?) would
substitute "off white" for white background, and "dark text" for
truely black text.  It claimed this small change was significant.

Anyone else hear of it?  Or believe it?  Sounds plausible, yet
still a bit fishy...

___tony___
 

At 05:52 AM 11/24/1999 -0800, Fred Cohen wrote:
>From: Fred Cohen fc@a...
>
>FROM ZDNET: http://www.zdnet.co.uk/news/1999/42/ns-10976.html
>
>News Burst: Cypherpunks publish proof of TEMPEST
>Tue, 26 Oct 1999 12:04:06 GMT
>Will Knight
>ZDNN UK TECH NEWS
>
>Information concerning a semi-mythical electromagnetic computer
>monitoring technology developed by the US government has been
>uncovered by Cypherpunks, an American technology activism
>group. 
>
>The technology, TEMPEST, supposedly allows computer activity
>to be monitored remotely according to electromagnetic radiation
>emanations. TEMPEST has long been rumoured although no
>concrete proof of it has ever been discovered. 
>
>Cypherpunks claims to have obtained information about
>TEMPEST from the US National Security Agency (NSA) through
>the freedom of information act and have published the information:
>
>http://cryptome.org/nt1-92-1-5.htm
>
>FC